Milankovitch Cyclicity in the Upper Rotliegend Group of The Netherlands Offshore
- P. L. de Boer2 and
- D. G. Smith3
Published Online: 29 APR 2009
Copyright © 1994 The International Association of Sedimentologists
Orbital Forcing and Cyclic Sequences
How to Cite
Yang, C. S. and Baumfalk, Y. A. (1994) Milankovitch Cyclicity in the Upper Rotliegend Group of The Netherlands Offshore, in Orbital Forcing and Cyclic Sequences (eds P. L. de Boer and D. G. Smith), Blackwell Publishing Ltd., Oxford, UK. doi: 10.1002/9781444304039.ch5
Utrecht, The Netherlands
- Published Online: 29 APR 2009
- Published Print: 28 JAN 1994
Print ISBN: 9780632037360
Online ISBN: 9781444304039
- Milankovitch cyclicity in Upper Rotliegend group;
- upper Rotliegend Group;
- basin-wide sequence stratigraphic analysis;
- high-resolution cyclicity analysis;
- spectral analysis of the wireline data
The stratigraphic subdivision and correlation of the Upper Rotliegend Group in The Netherlands offshore still provides difficulties, despite the extensive hydrocarbon exploration activities in the last two decades. One of the problems is the lack of biostratigraphic data.
Several kinds of cycles can be discerned in the Upper Rotliegend Group. Third-order sequences are distinct in the wireline logs of the Upper Rotliegend Group. They consist of parasequences or parasequence sets. Based on an analysis of wireline logs of 150 released wells in The Netherlands offshore, 12 third-order sequences, which can be grouped into five supersequences, are discerned in the Upper Rotliegend Group.
In addition to the third-order sequences, a number of higher-order cycles can also be observed in the wireline logs of the Upper Rotliegend Group. Using spectral analysis, a limited number of frequencies can be detected in the wireline log data. The corresponding wavelengths are usually in the range of 1–10m. The ratios between these wavelengths are very close to the ratios between Milankovitch periods for the Early Permian. Therefore the conclusion is that they are linked to the Milankovitch cycles. Using this approach, the time interval and the net sediment accumulation rates of each third-order sequence can be estimated. Most third-order sequences have a duration of 0.7–1.4 Ma. The net sediment accumulation rates show a long-term trend, which may reflect a long-term climate change and/or the tectonic evolution of the basin. Such a pattern can be used in sequence correlation.
The results of this study show:
1 The upper part of the Upper Rotliegend Group (i.e. Silverpit Formation) contains well-preserved cyclicities. Cyclicities in the lower part are less clear.
2 Based on the sequence and cyclicity analyses, we estimate the total time represented in the Upper Rotliegend Group sediments of The Netherlands to be 10.7 Ma.
Therefore it can be assumed that the Upper Rotliegend of The Netherlands was deposited at approximately 266.8–256.1 Ma, i.e. within the Artinskian and the Kungurian Stages.